•Material ABS •Using 4.5V 40mAh amorphous silicon solar panel charging,10hours of full power light,1 •1.5hours continuous discharge,5-year service life •Under normal use,can be recharged repeatedly,at least 500 times •Note:Ideal battery voltage discharge can not run out, better not lower than 2.75V, otherwise easily damage the battery life •On back have a button,the button contral the light,can printing LOGO on back